Drop Invoice update_amount hookc.
Drop Invoice update_amount hookc.

xuewenfei/bookyt,silvermind/bookyt,wtag/bookyt,hauledev/bookyt,xuewenfei/bookyt,huerlisi/bookyt,gaapt/bookyt,hauledev/bookyt,gaapt/bookyt,gaapt/bookyt,silvermind/bookyt,silvermind/bookyt,gaapt/bookyt,hauledev/bookyt,wtag/bookyt,huerlisi/bookyt,xuewenfei/bookyt,silvermind/bookyt,huerlisi/bookyt,wtag/bookyt,hauledev/bookyt